Information must be stored so that it is secure from accidental deletion.
必须把资料保存起来，这样才不至于无意中删除。
Construct an efficient and secure solution scheme of member deletion problem in group signature.
构造了群签名中高效安全的群成员删除问题的解决方案。
Improved Secure file deletion on FAT32 file system.
改进对FAT32文件系统的安全文件删除。
Improved Secure file deletion on FAT32 file system.
改进对FAT32文件系统的安全文件删除。
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